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<h1>philips-pcf8574.h</h1>  </div>
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<a href="philips-pcf8574_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*!@addtogroup other</span>
<a name="l00002"></a>00002 <span class="comment"> * @{</span>
<a name="l00003"></a>00003 <span class="comment"> * @defgroup pcf8574 Philips PCF8574</span>
<a name="l00004"></a>00004 <span class="comment"> * Philips PCF8574</span>
<a name="l00005"></a>00005 <span class="comment"> * @{</span>
<a name="l00006"></a>00006 <span class="comment"> */</span>
<a name="l00007"></a>00007 
<a name="l00008"></a>00008 <span class="comment">/*</span>
<a name="l00009"></a>00009 <span class="comment"> * $Id: philips-pcf8574.h 133 2013-03-10 15:15:38Z xander $</span>
<a name="l00010"></a>00010 <span class="comment"> */</span>
<a name="l00011"></a>00011 
<a name="l00012"></a>00012 <span class="preprocessor">#ifndef __PCF8574_H__</span>
<a name="l00013"></a>00013 <span class="preprocessor"></span><span class="preprocessor">#define __PCF8574_H__</span>
<a name="l00014"></a>00014 <span class="preprocessor"></span><span class="comment">/** \file philips-pcf8574.h</span>
<a name="l00015"></a>00015 <span class="comment"> * \brief Philips PCF8574 IO MUX driver</span>
<a name="l00016"></a>00016 <span class="comment"> *</span>
<a name="l00017"></a>00017 <span class="comment"> * philips-pcf8574.h provides an API for the Philips PCF8574 IO MUX.</span>
<a name="l00018"></a>00018 <span class="comment"> *</span>
<a name="l00019"></a>00019 <span class="comment"> * Changelog:</span>
<a name="l00020"></a>00020 <span class="comment"> * - 0.1: Initial release</span>
<a name="l00021"></a>00021 <span class="comment"> *</span>
<a name="l00022"></a>00022 <span class="comment"> * Credits:</span>
<a name="l00023"></a>00023 <span class="comment"> * - Big thanks to Mindsensors for providing me with the hardware necessary to write and test this.</span>
<a name="l00024"></a>00024 <span class="comment"> *</span>
<a name="l00025"></a>00025 <span class="comment"> * License: You may use this code as you wish, provided you give credit where its due.</span>
<a name="l00026"></a>00026 <span class="comment"> *</span>
<a name="l00027"></a>00027 <span class="comment"> * THIS CODE WILL ONLY WORK WITH ROBOTC VERSION 3.59 AND HIGHER. </span>
<a name="l00028"></a>00028 <span class="comment"></span>
<a name="l00029"></a>00029 <span class="comment"> * \author Xander Soldaat (xander_at_botbench.com)</span>
<a name="l00030"></a>00030 <span class="comment"> * \date 30 March 2010</span>
<a name="l00031"></a>00031 <span class="comment"> * \version 0.1</span>
<a name="l00032"></a>00032 <span class="comment"> * \example philips-pcf8574-test1.c</span>
<a name="l00033"></a>00033 <span class="comment"> */</span>
<a name="l00034"></a>00034 
<a name="l00035"></a>00035 <span class="preprocessor">#pragma systemFile</span>
<a name="l00036"></a>00036 <span class="preprocessor"></span>
<a name="l00037"></a>00037 <span class="preprocessor">#ifndef __COMMON_H__</span>
<a name="l00038"></a>00038 <span class="preprocessor"></span><span class="preprocessor">#include &quot;<a class="code" href="common_8h.html" title="Commonly used functions used by drivers.">common.h</a>&quot;</span>
<a name="l00039"></a>00039 <span class="preprocessor">#endif</span>
<a name="l00040"></a>00040 <span class="preprocessor"></span>
<a name="l00041"></a><a class="code" href="group__pcf8574.html#gaaf268d482fc19dc735975bde058fa88e">00041</a> <span class="preprocessor">#define PCF8574_I2C_ADDR         0x70  </span><span class="comment">/*!&lt; HDMMUX I2C device address */</span>
<a name="l00042"></a>00042 
<a name="l00043"></a>00043 
<a name="l00044"></a><a class="code" href="group__pcf8574.html#ga0e945c94589c30cf41bfbc33a3849aca">00044</a> <a class="code" href="group__common.html#gaa172ef131853460e5b9f5c6db81d30f4">tByteArray</a> <a class="code" href="group__pcf8574.html#ga0e945c94589c30cf41bfbc33a3849aca">PCF8574_I2CRequest</a>;    <span class="comment">/*!&lt; Array to hold I2C command data */</span>
<a name="l00045"></a><a class="code" href="group__pcf8574.html#ga61ab56cad1fd65d32397399e6072844f">00045</a> <a class="code" href="group__common.html#gaa172ef131853460e5b9f5c6db81d30f4">tByteArray</a> <a class="code" href="group__pcf8574.html#ga61ab56cad1fd65d32397399e6072844f">PCF8574_I2CReply</a>;      <span class="comment">/*!&lt; Array to hold I2C reply data */</span>
<a name="l00046"></a>00046 
<a name="l00047"></a>00047 <span class="comment">// Function prototypes</span>
<a name="l00048"></a>00048 <span class="keywordtype">bool</span> <a class="code" href="group__pcf8574.html#gab93b5319ae75a2ee6c08b8d83dae66b6">PCF8574sendBytes</a>(tSensors link, ubyte _byte);
<a name="l00049"></a>00049 <span class="keywordtype">bool</span> <a class="code" href="group__pcf8574.html#gae111fe3d5b95b60fd36b3e35b9e106ad">PCF8574readBytes</a>(tSensors link, ubyte &amp;_byte);
<a name="l00050"></a>00050 <span class="comment"></span>
<a name="l00051"></a>00051 <span class="comment">/**</span>
<a name="l00052"></a>00052 <span class="comment"> * Send a byte to the PCF8574 to set the IO ports</span>
<a name="l00053"></a>00053 <span class="comment"> *</span>
<a name="l00054"></a>00054 <span class="comment"> * @param link the PCF8574 port number</span>
<a name="l00055"></a>00055 <span class="comment"> * @param _byte the byte to be sent</span>
<a name="l00056"></a>00056 <span class="comment"> * @return true if no error occured, false if it did</span>
<a name="l00057"></a>00057 <span class="comment"> */</span>
<a name="l00058"></a><a class="code" href="group__pcf8574.html#gab93b5319ae75a2ee6c08b8d83dae66b6">00058</a> <span class="keywordtype">bool</span> <a class="code" href="group__pcf8574.html#gab93b5319ae75a2ee6c08b8d83dae66b6">PCF8574sendBytes</a>(tSensors link, ubyte _byte) {
<a name="l00059"></a>00059   memset(<a class="code" href="group__pcf8574.html#ga0e945c94589c30cf41bfbc33a3849aca">PCF8574_I2CRequest</a>, 0, <span class="keyword">sizeof</span>(<a class="code" href="group__common.html#gaa172ef131853460e5b9f5c6db81d30f4">tByteArray</a>));
<a name="l00060"></a>00060 
<a name="l00061"></a>00061   <a class="code" href="group__pcf8574.html#ga0e945c94589c30cf41bfbc33a3849aca">PCF8574_I2CRequest</a>[0] = 2;               <span class="comment">// Message size</span>
<a name="l00062"></a>00062   <a class="code" href="group__pcf8574.html#ga0e945c94589c30cf41bfbc33a3849aca">PCF8574_I2CRequest</a>[1] = <a class="code" href="group__pcf8574.html#gaaf268d482fc19dc735975bde058fa88e">PCF8574_I2C_ADDR</a>; <span class="comment">// I2C Address</span>
<a name="l00063"></a>00063   <a class="code" href="group__pcf8574.html#ga0e945c94589c30cf41bfbc33a3849aca">PCF8574_I2CRequest</a>[2] = _byte;
<a name="l00064"></a>00064 
<a name="l00065"></a>00065   <span class="keywordflow">return</span> <a class="code" href="group__common.html#gad02e06f83b264ee6fc7df41eb4712080">writeI2C</a>(link, <a class="code" href="group__pcf8574.html#ga0e945c94589c30cf41bfbc33a3849aca">PCF8574_I2CRequest</a>);
<a name="l00066"></a>00066 }
<a name="l00067"></a>00067 
<a name="l00068"></a>00068 <span class="comment"></span>
<a name="l00069"></a>00069 <span class="comment">/**</span>
<a name="l00070"></a>00070 <span class="comment"> * Read the current state of the ports on the PCF8574</span>
<a name="l00071"></a>00071 <span class="comment"> *</span>
<a name="l00072"></a>00072 <span class="comment"> * @param link the PCF8574 port number</span>
<a name="l00073"></a>00073 <span class="comment"> * @param _byte the byte thats been read</span>
<a name="l00074"></a>00074 <span class="comment"> * @return true if no error occured, false if it did</span>
<a name="l00075"></a>00075 <span class="comment"> */</span>
<a name="l00076"></a><a class="code" href="group__pcf8574.html#gae111fe3d5b95b60fd36b3e35b9e106ad">00076</a> <span class="keywordtype">bool</span> <a class="code" href="group__pcf8574.html#gae111fe3d5b95b60fd36b3e35b9e106ad">PCF8574readBytes</a>(tSensors link, ubyte &amp;_byte) {
<a name="l00077"></a>00077   memset(<a class="code" href="group__pcf8574.html#ga0e945c94589c30cf41bfbc33a3849aca">PCF8574_I2CRequest</a>, 0, <span class="keyword">sizeof</span>(<a class="code" href="group__common.html#gaa172ef131853460e5b9f5c6db81d30f4">tByteArray</a>));
<a name="l00078"></a>00078 
<a name="l00079"></a>00079   <a class="code" href="group__pcf8574.html#ga0e945c94589c30cf41bfbc33a3849aca">PCF8574_I2CRequest</a>[0] = 1;               <span class="comment">// Message size</span>
<a name="l00080"></a>00080   <a class="code" href="group__pcf8574.html#ga0e945c94589c30cf41bfbc33a3849aca">PCF8574_I2CRequest</a>[1] = <a class="code" href="group__pcf8574.html#gaaf268d482fc19dc735975bde058fa88e">PCF8574_I2C_ADDR</a>; <span class="comment">// I2C Address</span>
<a name="l00081"></a>00081   <a class="code" href="group__pcf8574.html#ga0e945c94589c30cf41bfbc33a3849aca">PCF8574_I2CRequest</a>[2] = _byte;
<a name="l00082"></a>00082 
<a name="l00083"></a>00083   <span class="keywordflow">if</span> (!<a class="code" href="group__common.html#gad02e06f83b264ee6fc7df41eb4712080">writeI2C</a>(link, <a class="code" href="group__pcf8574.html#ga0e945c94589c30cf41bfbc33a3849aca">PCF8574_I2CRequest</a>, <a class="code" href="group__pcf8574.html#ga61ab56cad1fd65d32397399e6072844f">PCF8574_I2CReply</a>, 1))
<a name="l00084"></a>00084     <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00085"></a>00085 
<a name="l00086"></a>00086   _byte = <a class="code" href="group__pcf8574.html#ga61ab56cad1fd65d32397399e6072844f">PCF8574_I2CReply</a>[0];
<a name="l00087"></a>00087 
<a name="l00088"></a>00088   <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00089"></a>00089 
<a name="l00090"></a>00090 }
<a name="l00091"></a>00091 
<a name="l00092"></a>00092 
<a name="l00093"></a>00093 <span class="preprocessor">#endif //  __PCF8574_H__</span>
<a name="l00094"></a>00094 <span class="preprocessor"></span>
<a name="l00095"></a>00095 <span class="comment">/*</span>
<a name="l00096"></a>00096 <span class="comment"> * $Id: philips-pcf8574.h 133 2013-03-10 15:15:38Z xander $</span>
<a name="l00097"></a>00097 <span class="comment"> */</span>
<a name="l00098"></a>00098 <span class="comment">/* @} */</span>
<a name="l00099"></a>00099 <span class="comment">/* @} */</span>
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